Question 17867: Equal Numeric Indices Do Not Give Parameters and Observations the Same Role

Original question and givens

Use parameter indices=Fin(2)={0,…,1} and one shared outcome space=Fin(3)={0,…,2}, with the complete parameter-by-outcome candidate law table=[[1/20, 1/20, 18/20], [1/2, 1/3, 1/6]]. Every row must be nonnegative and sum exactly to 1 before the table qualifies as a statistical model. Keep parameter and observation roles distinct even when their numeric indices agree. A likelihood fixes the observed outcome and varies the parameter; no prior, posterior, identifiability or inferential optimality is implied. Rational computations are exact. parameter=0, outcome=1. Give (parameter,outcome,parameter_index,observed_outcome,law_value,same_role?,parameter_not_observation_and_likelihood_not_posterior).

• G001 — Use parameter indices=Fin(2)={0,…,1} and one shared outcome space=Fin(3)={0,…,2}, with the complete parameter-by-outcome candidate law table=[[1/20, 1/20, 18/20], [1/2, 1/3, 1/6]]. Every row must be nonnegative and sum exactly to 1 before the table qualifies as a statistical model. Keep parameter and observation roles distinct even when their numeric indices agree. A likelihood fixes the observed outcome and varies the parameter; no prior, posterior, identifiability or inferential optimality is implied. Rational computations are exact. parameter=0, outcome=1. Give (parameter,outcome,parameter_index,observed_outcome,law_value,same_role?,parameter_not_observation_and_likelihood_not_posterior).

Definition and scope

Use the original question domain, assumptions and cited MKO definitions. This item has second-context mathematical and bilingual review, with the model, answer and every arithmetic step independently recomputed from the original parameters; the source question remains a candidate.

• mko-parametric-statistical-model

Step-by-step derivation

parameter0 complete outcome mass sum := sum(1/20, 1/20, 9/10)

parameter0 complete outcome mass sum = 1

original parameter row=0;SAME outcome carrier Fin(3);original aligned rational entries=[[1, 20], [1, 20], [18, 20]]

reduced rational candidate entries=[1/20, 1/20, 9/10];sum=1;nonnegative=Yes;row qualified=Yes

parameter1 complete outcome mass sum := sum(1/2, 1/3, 1/6)

parameter1 complete outcome mass sum = 1

original parameter row=1;SAME outcome carrier Fin(3);original aligned rational entries=[[1, 2], [1, 3], [1, 6]]

reduced rational candidate entries=[1/2, 1/3, 1/6];sum=1;nonnegative=Yes;row qualified=Yes

original parameter carrier Fin(2);common outcome carrier Fin(3);ALL original row audits=[[0, [1/20, 1/20, 9/10], 1, Yes], [1, [1/2, 1/3, 1/6], 1, Yes]]

whole model qualified=Yes;common_sample_space;no parameter prior or posterior supplied

original parameter index=0;original observed-outcome index=1;candidate full row=[1/20, 1/20, 9/10]

raw candidate cell=1/20;whole-table qualification remains=Yes

numeric labels parameter=0;outcome=1;numeric equality=No;same raw cell=1/20

parameter role=parameter_index;outcome role=observed_outcome;same semantic role=No;parameter_not_observation_and_likelihood_not_posterior

Reverse checks

• S007 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S006 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S005 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S004 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S003 · premise_and_result_audit — Recompute parameter1 complete outcome mass sum with exact rational arithmetic, not rounded decimals.
• S002 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
• S001 · premise_and_result_audit — Recompute parameter0 complete outcome mass sum with exact rational arithmetic, not rounded decimals.

Result

(0, 1, parameter_index, observed_outcome, 1/20, No, parameter_not_observation_and_likelihood_not_posterior)

The full substitutions and premise checks give the original answer; source identity,format and status are unchanged.

This question review and source binding

Review date: 2026-10-26

Original questions, answers, step expressions, numeric ASTs and historical records are retained. Source candidate labels remain historical and are not overwritten as formal proof.